Izaak Philip Reindorp was a son of Hartog Reindorp (deceased 15 Mei 1931 in Apeldoorn) and Esther Croese (burial in Diemen 30 April 1925). He had four other brothers and one sister: Annaatje, Asser Abraham, Mozes, Joseph and Asser, who died only 3 years old in September 1896.
Izaak Philip Reindorp married in Amsterdam on 1 May 1924 to Vogelina Veffer, daughter of Hijman Veffer and Golda Veldman.
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